8120915 has 24 divisors (see below), whose sum is σ = 11082624. Its totient is φ = 5702400.

The previous prime is 8120891. The next prime is 8120921. The reversal of 8120915 is 5190218.

It is a happy number.

It is not a de Polignac number, because 8120915 - 2⁸ = 8120659 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18539 + ... + 18971.

It is an arithmetic number, because the mean of its divisors is an integer number (461776).

Almost surely, 2^8120915 is an apocalyptic number.

8120915 is a deficient number, since it is larger than the sum of its proper divisors (2961709).

8120915 is a wasteful number, since it uses less digits than its factorization.

8120915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 8120915 is about 2849.7219162578. The cubic root of 8120915 is about 201.0025906616.

The spelling of 8120915 in words is "eight million, one hundred twenty thousand, nine hundred fifteen".